99 lines
4.2 KiB
C#
99 lines
4.2 KiB
C#
// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
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// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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namespace Microsoft.AspNet.Mvc.Razor
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{
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/// <summary>
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/// Contains methods to locate <c>_ViewStart.cshtml</c> and <c>_GlobalImport.cshtml</c>
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/// </summary>
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public static class ViewHierarchyUtility
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{
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private const string ViewStartFileName = "_ViewStart.cshtml";
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private const string GlobalImportFileName = "_GlobalImport.cshtml";
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/// <summary>
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/// Gets the view start locations that are applicable to the specified path.
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/// </summary>
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/// <param name="applicationRelativePath">The application relative path of the file to locate
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/// <c>_ViewStart</c>s for.</param>
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/// <returns>A sequence of paths that represent potential view start locations.</returns>
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/// <remarks>
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/// This method returns paths starting from the directory of <paramref name="applicationRelativePath"/> and
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/// moves upwards until it hits the application root.
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/// e.g.
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/// /Views/Home/View.cshtml -> [ /Views/Home/_ViewStart.cshtml, /Views/_ViewStart.cshtml, /_ViewStart.cshtml ]
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/// </remarks>
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public static IEnumerable<string> GetViewStartLocations(string applicationRelativePath)
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{
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return GetHierarchicalPath(applicationRelativePath, ViewStartFileName);
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}
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/// <summary>
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/// Gets the locations for <c>_GlobalImport</c>s that are applicable to the specified path.
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/// </summary>
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/// <param name="applicationRelativePath">The application relative path of the file to locate
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/// <c>_GlobalImport</c>s for.</param>
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/// <returns>A sequence of paths that represent potential <c>_GlobalImport</c> locations.</returns>
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/// <remarks>
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/// This method returns paths starting from the directory of <paramref name="applicationRelativePath"/> and
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/// moves upwards until it hits the application root.
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/// e.g.
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/// /Views/Home/View.cshtml -> [ /Views/Home/_GlobalImport.cshtml, /Views/_GlobalImport.cshtml,
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/// /_GlobalImport.cshtml ]
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/// </remarks>
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public static IEnumerable<string> GetGlobalImportLocations(string applicationRelativePath)
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{
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return GetHierarchicalPath(applicationRelativePath, GlobalImportFileName);
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}
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private static IEnumerable<string> GetHierarchicalPath(string relativePath, string fileName)
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{
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if (string.IsNullOrEmpty(relativePath))
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{
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return Enumerable.Empty<string>();
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}
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if (relativePath.StartsWith("~/", StringComparison.Ordinal))
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{
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relativePath = relativePath.Substring(2);
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}
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if (relativePath.StartsWith("/", StringComparison.Ordinal))
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{
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relativePath = relativePath.Substring(1);
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}
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if (Path.IsPathRooted(relativePath))
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{
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// If the path looks like it's not app relative, don't attempt to construct paths.
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return Enumerable.Empty<string>();
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}
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if (string.Equals(Path.GetFileName(relativePath), fileName, StringComparison.OrdinalIgnoreCase))
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{
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// If the specified path is for the file hierarchy being constructed, then the first file that applies
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// to it is in a parent directory.
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relativePath = Path.GetDirectoryName(relativePath);
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if (string.IsNullOrEmpty(relativePath))
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{
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return Enumerable.Empty<string>();
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}
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}
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var locations = new List<string>();
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while (!string.IsNullOrEmpty(relativePath))
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{
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relativePath = Path.GetDirectoryName(relativePath);
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var path = Path.Combine(relativePath, fileName);
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locations.Add(path);
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}
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return locations;
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}
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}
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} |